GH907合金机匣锻环的超声衰减性能与其组织的关系  

Influence of Microstructure on Ultrasonic Attenuation of Forged GH907 Alloy Ring for Aero Engine Turbine Casing

作　　者：吕涛 刘芳[1] 刘畅[1] 董德秀[3] 张伟红 蔡桂喜[1] LV Tao;LIU Fang;LIU Chang;DONG Dexiu;ZHANG Weihong;CAI Guixi(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043

出　　处：《材料研究学报》2024年第1期14-22,共9页Chinese Journal of Materials Research

摘　　要：采用超声检测和组织分析并将衰减系数量化研究了GH907合金机匣锻环的组织对其超声波衰减性能的影响,并阐述了超声检测中底波损失的原因。结果表明:超声底波成像图中衰减较大区域的形状与GH907合金低倍组织中的黑晶区形状一致;黑晶区的平均晶粒尺寸大于非黑晶区,并有大量呈魏氏组织形貌的ε相;大量ε相的析出使超声衰减增大近40%。应该从细化晶粒、控制晶粒尺寸的均匀性和抑制ε相过量析出三方面优化锻造工艺以提高产品的合格率。Aiming at the matter of unqualified ultrasonic inspection results of the forged GH907 alloy ring used for aero engine turbine casing,the influence of the microstructure on the ultrasonic attenuation of the forged alloy ring is quantitatively assessed by means of ultrasonic testing and microstructure observation,and the cause of the bottom wave loss observed in ultrasonic testing is elucidated.The results show that the shape of the large attenuated area in the ultrasonic bottom wave amplitude image was consistent with that of the black grain area observed in the macrostructure of GH907 alloy,and the average grain size of the black grain area was larger than that of the non-black grain area,and there were a large number ofεphase with the morphology of Widmannsttten structure.The precipitation of a large number ofεphase can increase ultrasonic attenuation by nearly 40%.It is believed that the forging process should be optimized from the following three aspects:grain refinement,controlling the uniformity of grain size and inhibiting excessive precipitation ofεphase,so that to improve the qualification rate of the forged rings.

关 键 词：材料检测与分析技术 GH907合金 机匣锻环 超声检测 超声衰减 组织不均匀 

分 类 号：TG115.28[金属学及工艺—物理冶金]